CN202119614U - Air resistance characteristic testing device - Google Patents

Abstract

The utility model relates to an air resistance characteristic testing device and a design method thereof and is characterized by at least comprising an air inlet, a collecting air channel, a testing unit, a circular air draft duct and a circular air draft opening which are sequentially and hermetically connected, an air draft mechanism is arranged in the circular air draft opening, an object to be tested is arranged in the center of the testing unit, the outer wall of the testing unit is provided with testing holes in all directions and used for testing air speed and air pressure, micromanometers and a hot bulb anemometer are respectively fixed into the testing holes, and a micromanometer is fixed to the front end and the rear end of the object to be tested respectively. According to the principle of aerodynamics, the air draft mechanism provides a certain air pressure and air volume, constant air flow is obtained in an operating section through low-speed air tunnel commutation. According to a testing method for characteristics of a ventilating duct, the object to be tested is positioned in the operating section and simulates practical use state, at the moment, the inlet air speed is measured by the hot bulb anemometer, the first micromanometer and the second micromanometer are used for measuring pressure drop, namely the pressure difference at the front end and the rear end of the object 23 to be tested, corresponding drag coefficient is computed by the aid of relevant formulas, and air resistance characteristics of a sample to be tested are reflected.

Description

A kind of windage characteristic test device

Technical field

The utility model belongs to the air resistance coefficient technical field of measurement and test of ventilating part, relates to the air resistance coefficient proving installation of general ventilating part and shielding ventilating part.

Background technology

At present, many ventilating parts are arranged in the market, people often can not know its performance of ventilating very accurately, thereby select suitable ventilating part.In addition, along with the modern military development of electronic technology, make the residing electromagnetic environment very severe of military electronics.Because the requirement of operational mobility, the shielding shelter has obtained to use widely in military electronic system.Because the existence of abominable factor such as environment makes the electromagnetic environment of equipment or system worsen.Some shelters need be under the prerequisite that does not influence its bulk shielding usefulness, also will be to ventilating out of my cabin, so when design, need a kind of proving installation that can accurately test out the ventilating part air resistance coefficient just seem particularly important.

Summary of the invention

The purpose of the utility model is a kind of windage characteristic test device of design, and it provides accurate air resistance coefficient can for general ventilating part and shielding ventilating part, is applicable to the windage characteristic test to various ventilating parts.

The technical scheme of the utility model is: design a kind of windage characteristic test device; It is characterized in that: which comprises at least the air inlet, wind gathering air channel, test cell, circular air draft pipe, the circular suction opeing that are tightly connected successively; Circular suction opeing is built-in with air draft mechanism; Measured object places the center of test cell, and the outer wall all directions of test cell all have instrument connection, are used for the test of wind speed and blast; Be fixed with microbarograph and hot-bulb wind gage in the instrument connection respectively, each fixing microbarograph of the forward and backward two ends of measured object.

Described air draft mechanism is made up of air draft fan leaf, connecting link, rotating shaft, driving belt, motor, arrangements for speed regulation; One end of connecting link is fixed with air draft fan leaf; The other end of connecting link is fixed with rotating shaft, and rotating shaft is connected with drive of motor through driving belt, and motor is electrically connected with arrangements for speed regulation; Air draft fan leaf places in the circular suction opeing, and connecting link is in the home position of circular suction opeing.

Described test cell outer wall is the transparent organic glass material, and a sidewall is the hinge door that connects through hinge, is fixed with handle on the hinge door.

Be fixed with reinforcement in the described air inlet, be fixed with metal filter screen between the reinforcement.

Described wind gathering air channel is the funnel-shaped structure that a port is big, the other end is young, and a mouthful big end is fixedly connected with air inlet, and young end is fixedly connected with test cell.

Described circular suction opeing and air draft mechanism all are fixed on the fan supporter; The air channel structure that air inlet, wind gathering air channel, test cell, circular air draft pipe are formed is fixed on the support of air channel, and fan supporter and air channel support support certain altitude with whole device.

The beneficial effect of the utility model is: according to aerodynamic principle, air draft mechanism provides certain blast and air quantity, obtains the steady air-flow through the low-speed wind tunnel rectification at active section; Method of testing according to the ventilating duct characteristic device curve; Measured object is in active section and simulates actual user mode; The inlet velocity that use the hot-bulb wind gage to record this moment records pressure drop through first microbarograph and second microbarograph, i.e. the pressure reduction of measured object 23 front and back; Calculate corresponding air resistance coefficient through correlation formula at last, just reflected the windage characteristic of tested sample.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further specified.

Fig. 1 is an embodiment general structure synoptic diagram;

Fig. 2 is the utility model air draft mechanism structural representation;

Fig. 3 is the utility model air inlet structure synoptic diagram;

Fig. 4 is closed low-speed wind tunnel test philosophy figure.

Among the figure: 1, air inlet; 2, wind gathering air channel; 3, test cell; 4, circular air draft pipe; 5, circular suction opeing; 6, air draft fan leaf; 7, connecting link; 8, rotating shaft; 9, driving belt; 10, motor; 11, arrangements for speed regulation; 12, fan supporter; 13, air channel support; 14, instrument connection; 15, handle; 16, hinge door; 17, metal filter screen; 18, reinforcement; 19, first microbarograph; 20, hot-bulb wind gage; 21, second microbarograph; 22, Pitot tube; 23, measured object; 24, active section.

Embodiment

The windage characteristic test device of embodiment such as Fig. 1, shown in Figure 2; Which comprises at least the air inlet 1, wind gathering air channel 2, test cell 3, circular air draft pipe 4, the circular suction opeing 5 that are fixedly connected sequentially through screw; In order to guarantee the sealing of its joint face, the caulking gum liner all is installed according to the size and the shape of each joint face; Circular suction opeing 5 is built-in with air draft mechanism, and the outer wall all directions of test cell 3 all have instrument connection 14, are used for the test of wind speed and blast, are convenient to test the mean value of windage like this through different positions, make test result more accurate.Measured object 23 places the center of test cell 3, can use foam-filled thing to fill according to physical size with test cell 3 outer wall slits around the measured object 23.

Be fixed with microbarograph and hot-bulb wind gage 20 in the instrument connection 14 respectively; Each fixing microbarograph of measured object 23 forward and backward two ends; Measured object 23 front ends are that the air inlet end is fixed with first microbarograph 19; Measured object 23 rear ends are that air opening end is fixed with second microbarograph 21, and the test probe end of microbarograph and hot-bulb wind gage 20 extends in the test cell 3 through instrument connection 14, and fixing through Pitot tube 22.

The utility model is not limited only to this, and the foregoing description is the most basic structure just.Its other structure can also have advances an improvement as follows.

Described air draft mechanism is made up of air draft fan leaf 6, connecting link 7, rotating shaft 8, driving belt 9, motor 10, arrangements for speed regulation 11; One end of connecting link 7 is fixed with air draft fan leaf 6; The other end of connecting link 7 is fixed with rotating shaft 8, and rotating shaft 8 is in transmission connection through driving belt 9 and motor 10, and motor 10 is electrically connected with arrangements for speed regulation 11; Speed through control motor 10 rotating speeds comes the controlled wind speed size; Air draft fan leaf 6 places in the circular suction opeing 5, and connecting link 7 is in the home position of circular suction opeing 5, unloaded wind speed range: the 0.5～15m/s of this air draft mechanism.

As shown in Figure 3, can be fixed with reinforcement 18 in the air inlet 1, be fixed with metal filter screen 17 between the reinforcement 18, be used for filtering the impurity of environment, influence the accuracy of its test after impurity is drawn on the measured object 23 when avoiding exhausting.

Described wind gathering air channel 2 is funnel-shaped structures that a port is big, the other end is young, and a mouthful big end is fixedly connected with air inlet 1, and young end is fixedly connected with test cell 3, so just can air inlet 1 inlet air be concentrated to test cell 3 inlets.

Described test cell 3 outer walls are the transparent organic glass material; Observe during convenient the test and use; One sidewall is the hinge door 16 that connects through hinge; Be fixed with handle 15 on the hinge door 16, make things convenient for putting into and taking out of measured object, liner is housed around the hinge door through pulling handle 15 opening hinge doors 16.

Described circular suction opeing 5 and air draft mechanism all are fixed on the fan supporter 12; The air channel structure that air inlet 1, wind gathering air channel 2, test cell 3, circular air draft pipe 4 are formed is fixed on the air channel support 13, and fan supporter 12 supports certain altitude with air channel support 13 with whole device.

The test philosophy of this device is following:

As shown in Figure 4, the windage characteristic test device adopts the air draft mechanism air-supply, and according to aerodynamic principle, air draft mechanism provides certain blast and air quantity, obtains the steady air-flow through the low-speed wind tunnel rectification at active section 24; Method of testing according to the ventilating duct characteristic device curve; Measured object 23 is in active section and simulates actual user mode; The inlet velocity that use hot-bulb wind gage 20 to record this moment; Record pressure drop through first microbarograph 19 and second microbarograph 21, i.e. the pressure reduction of measured object 23 front and back has just reflected the windage characteristic of tested sample.

In the actual test of closed low-speed wind tunnel, hot-bulb anemoscope 20 is measured the inlet velocity V that obtains sample; In measured object 23 windward sides, promptly measured object 23 front ends insert first microbarograph 19 then, measure blast p ₁Extract first microbarograph 19 at last, at measured object 23 lee faces, promptly second microbarograph 21 is inserted in measured object 23 backs, measures blast p ₂

The pressure loss (pressure drop) through tested sample is:

Δp＝p ₁-p ₂

Corresponding air resistance coefficient is: $\mathrm{\&xi;}=\frac{\mathrm{\&Delta;\; <figure-callout\; id="1"\; label="p"\; filenames="DEST\_PATH\_110711150643.png"\; state="\{\{state\}\}">p</figure-callout>}}{\frac{1}{2}\mathrm{\&rho;}{V}^2}.$

Claims (6)

1. windage characteristic test device; It is characterized in that: which comprises at least the air inlet (1), wind gathering air channel (2), test cell (3), circular air draft pipe (4), the circular suction opeing (5) that are tightly connected successively; Circular suction opeing (5) is built-in with air draft mechanism; Measured object (23) places the center of test cell (3), and the outer wall all directions of test cell (3) all have instrument connection (14), are used for the test of wind speed and blast; Be fixed with microbarograph and hot-bulb wind gage (20) in the instrument connection (14) respectively, each fixing microbarograph of the forward and backward two ends of measured object (23).

2. a kind of windage characteristic test device according to claim 1; It is characterized in that: described air draft mechanism is made up of air draft fan leaf (6), connecting link (7), rotating shaft (8), driving belt (9), motor (10), arrangements for speed regulation (11); One end of connecting link (7) is fixed with air draft fan leaf (6); The other end of connecting link (7) is fixed with rotating shaft (8), and rotating shaft (8) is in transmission connection through driving belt (9) and motor (10), and motor (10) is electrically connected with arrangements for speed regulation (11); Air draft fan leaf (6) places in the circular suction opeing (5), and connecting link (7) is in the home position of circular suction opeing (5).

3. a kind of windage characteristic test device according to claim 1; It is characterized in that: described test cell (3) outer wall is the transparent organic glass material; One sidewall is the hinge door (16) that connects through hinge, is fixed with handle (15) on the hinge door (16).

4. a kind of windage characteristic test device according to claim 1 is characterized in that: be fixed with reinforcement (18) in the described air inlet (1), be fixed with metal filter screen (17) between the reinforcement (18).

5. a kind of windage characteristic test device according to claim 1; It is characterized in that: described wind gathering air channel (2) is the funnel-shaped structure that a port is big, the other end is young; The big end of mouth is fixedly connected with air inlet (1), and young end is fixedly connected with test cell (3).

6. a kind of windage characteristic test device according to claim 1; It is characterized in that: described circular suction opeing (5) and air draft mechanism all are fixed on the fan supporter (12); The air channel structure that air inlet (1), wind gathering air channel (2), test cell (3), circular air draft pipe (4) are formed is fixed on the air channel support (13), and fan supporter (12) and air channel support (13) support certain altitude with whole device.

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